Tapping attachment for drilling-machines.



R.- MILNB. TAPPING ATTACHMENT FOB DRILLING MACHINES. APPLICATION FILEDPERA, 1908. I 928,178()v 'Patented July 20. 1909.

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R. MILNB. TAIPPING ATTACHMENT FOR DRILLING MAQHINES. APPLIOATIGN FILED113.4, 190e.

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j @am Patented July 2o, 1909.

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ROBERT MILNE, OF ROCKFORD, ILLINOIS, ASSIGNOR TO ROCKFORD DRILLINGMACHINE COMPANY, A CORPORATION OF ILLINOIS.

TAPPING ATTACHMENT FOR DRILLING-MACHINES.

ivo. 928,780.

Specication of Letters Patent.

Patented July 2o, 1909.

Application filed February 1908. Serial No. 414,199.

Fo all whom t may concern:

Be it known that I, ROBERT MILNE, a citizen of the United States,residing at Rockford, in the county of Winnebago and State of Illinois,have invented certain new and useful Improvements in Tapping Attachmentsfor Drilling-Niachines, of which the following is a specification.

The object of this invention is lto provide a tapping attachment,ofsuitable formation and construction to be applied to the head of astandard drilling machine withoutmaterially disorganizing or rearrangingthe drilling mechanism.

In certain prior constructions the reversing feed for the tappingattachment has been derived from gears positioned on the main drivingshaft at a point behind the beveled gear wheel for the drill spindle.rI'his method of securing the reversing` drive for the tappingattachment is objectionable, in that it requires considerablereadjustment and rearrangement of the upper portion of the drillingmachine, and likewise necessitates the employment of a greater number ofgears than is necessary in securing the reverse drive for the drillspindle of the present invention.

A further object of the invention is to simplify the structure andrender it more compact than has hitherto been possible in tappingattachments of previous construc- 1 tions.

The invention consists in the features of construction and combinationof parts hereinafter described and claimed.

In the drawings, Figure 1 is a side elevation of the tapping attachmentof the present invention positioned on the head of a drilling machineframe; Fig. Q a similar view showing the reverse side of the attachment;Fig. 3 a top or plan view of the same; F ig. 4 a front elevation of thesame; Fig. 5 a sectional plan view taken on line 5 5 of Fig. 1 lookingin the direction of the arrow; and Fig. 6 a detail showing thetransmission gears.

The attachment is applied to the top of a drilling machine of standardconstruction, having a main frame 7, the top of which only is shown,which frame terminates in a journal head 8 within which a vertical drillspindle 9 is mounted. The spindle has loosely journaled thereon, abovethe head 8, a beveled spindle gear 10 which meshes with a driving bevelpinion 11 on the forward endA of a main driving shaft 12,'whicharrangement of the beveled gear wheel and driving pinion is of standardconstruction in drilling machines. In providing the drilling machinewith a tapping attachment, the drill spindle 9 is upwardly extended, asshown, a considerable distance above the beveled gear wheel, whichlatter connects with an upwardly extending sleeve 13 which carries onits top a transmission spur gear wheel 14, which forms, in effect, anextension of the spindle gear wheel. The gear wheel 14 is provided, onits upper face, with clutch teeth 15 which are adapted to register withlower teeth 16 on a movable clutch collar 17 which is slidably keyed onthe drill spindle and is provided with the usual clutch groove 18. Theclutch collar 17 is provided with upper teeth 19, having a reversethrust as compared with the Ylower teeth, whichV upper teeth are adaptedto register with reversing clutch teeth 2O formed on the under face of areversing gear wheel 21, which is loosely journaled upon the extendeddrill spindle 9 as a mounting, and is provided with an upwardlyextending journal sleeve 22 which passes through a journal bracket head23 which forms the extreme top of the frame of the tapping attachment.The sleeve 21 has secured thereto a collar 2a which bears against theupper face of the bracket head Q3, which arrangement provides a suitablebearing for the reversing gear wheel 21.

'Ihe bracket head Q3 has connected therewith side supporting arms 25which merge into a single supporting standard 26 which springs from arecessed plate 27, which plate affords the upper half of a journal boxfor the main driving shaft 12, the lower' half being afforded by a lowerrecessed plate 28 connected by a short standard 29 with the top Aof themain frame 7. rI`he structure is further reinforced by a front bracket30 of forwardly bowed format-ion, which bridgesv the space between themain journal head 8 and the bracketv journal head 23, and serves, incombination with the supporting arms 25, to provide a compact and rigidstructure for the mounting of the reversing gears. rlhe front bracketfurther serves as a mounting for a transversely extending yoke pin 3l,which is passed through an inwardly projecting tongue 32 formed on theinner edge of the bracket in substantial alinement with the clutchgroove 18 on the movable clutch member. The pin has keyed thereto, onopposite sides, a pair of yoke hubs 33 and 34, the latter of which is ofgreater length than the former and is provided with a downwardlyextending tubular socket 35, which receives the upper end of a lever 36adapted to rock the pin 3l. Each of the yoke hubs is provided with aninwardly l ward drive to the drill spindle. When it 1s extending yokearm 37, which yoke arms embrace the movable clutch member and areprovided with inwardly extending fingers 38 which engage the slot 18, sothat the movement of the lever 3G will serve to throw the slidableclutch member from one position of adjustment to the other.

The supporting standard 2S is provided, on its top, with a centrallypositioned boss 39, through the center of which is slidably journaled agear transmission stub shaft 40, shown in F ig. G. rihe stub shaft has,at its lower end, inwardly cut gear teeth 41 which mesh with the teethof the transmission gear wheel 14. rThe stub shaft, at its upper end, isprovided with anupper transmission gear wheel 42, which is of largerdiameter than the stub shaft and rests upon the upper face of the boss39 as a bearing. The gear wheel 42 meshes with an intermediatetransmission gear wheel 43, shown in Fig. 5, which latter is housedwithin a chambered protuberance 44 formed on the side of one of thesupporting arms 25 near the point of juncture thereof with the journalbracket head 23. The intermediate gear wheel 43 also meshes with thereversing gear wheel 2l on the drill spindle, so that the upper geartransmission wheel and the upper reversing gear wheel' will travel inthe same direction.

Laterally adjacent to the boss 39 is an' inclined trackway whichterminates, at its upper end, in a hollow or concavity 4G, and thetrackway has mounted thereon a roller 4T which is journaled on the innerside of a yoke arm 48, which latter, at its upper end, terminates in ahead 49, to which is secured a yoke which may be termed the geardisengaging yoke as distinguished from the clutch yoke previouslydescribed.

The yoke 50 is of bowed formation and extends over the top of achanneled head 51, formed integral with and on top of the toptransmission gear wheel 42. The head yhas entered in the channel thereofa split collar 52 into the opposite sides of which are entered pins 53,which inwardly extend from opposite sides of the yoke 50. The yoke arm47 has entered into its end a lever 54 whereby it may be swung forwardand back.

`until it has reached the concavity at the forward upper end thereof,and this movement of the roller serves to raise the yoke 50, and with itthe split collar 52, thereby elevating the stub gear transmission shaft40 to a position in which the gear teeth 4l and the gear wheel 42 areout of mesh with the gears with which they normally cooperate.

In use7 when it is desirable to operate the machine for drillingpurposes, the transmission gears will be thrown out in the manner aboveindicated, and the clutch will be thrown to its lowerinost position,which gives a fordesired to use the machine for tapping purposes, thelever 54 will be thrown to position to lower the transmission gears andthereby throw them in mesh. Thereafter, when it is desired to give areverse movement to the drill spindle, the clutch member will be thrownto its elevated position, which brings it into engagement with the upperreversing gear wheel 2l, which, being in mesh with t-he reversing trainof gears, will give a reverse movement to the spindle. The constructionis one which interferes in no way with the drill structure and isadapted to be applied to drilling machines of standard formation,without requiring any substantial modification in the machine and bymerely attaching to the top of the machine frame the mechanismhereinbefore described and altering the beveled gear to the extentindicated. By securing the reversing drive from the top of the spindlegear wheel, instead of from elsewhere on the driving shaft, the gearwill be loca-ted at the mostadvantageous point to secure absoluterigidity and accuracy in work as weli as extreme compactness inarrangement.

In certain previous constructions, bevel gears rather than spur gearshave been used in the reversing chain. The use of spur gea rs is highlyadvantageous, in that no change is made in the angle of the drive, allthe gears revolving on a vertical axis. This gives a maximum ofcompactness and etiiciency and considerably cheapens the cost in thatspur gears are much less expensive and are ordinarily more accuratelyregistered in mesh than bevel gears.

It is not intended to limit the invention to the precise details ofconstruction and arrangement shown and described, since the manner ofpositioning and mounting the gears may be changed or modiiied, and theciut'ch mechanism changed or other well known clutch mechanismsubstituted therefor without changing the character of the invention. Inlike manner, other details of the invention may be modified withoutsubstantial change in the operation of the mechanism.

Vhat 1 regard as new'and desire to secure by Letters Patent is:

1. 1n a tapping attachment for drilling machines, the combination of adrill spindle, the spindle gear wheel and connected transmission gearrotatably mounted on the drill spindle, a clutch collar slidably keyedon the drill spindle and adapted, when in lowered position, to engagewith the transmission gear wheel, an upper reversing gear wheelrotatably mounted on the spindle above the' clutch collar, transmissiongearing in mesh iith the transmission gear wheel and the reversing gearwheel, a member adapted to litt the transmission gearing out ofoperative position, a roller journaled to said lifting member, and aninclined trackway, upon which the roller is adapted to run and soarranged as to elevate the lifting member when the roller reaches thetop of the trackway, substantially as described.

2. ln a tapping attachment for drilling machines, the combination of adrill spindle, the spindle gear wheel and attached transmission gearwheel rotatably mounted on the drill spindle,a reversing gear wheelrotatably mounted onthe drill spindle, a clutch collar slidably keyed tothe drill spindle and adapted to be thrown into engagement with eitherthe transmission or reversing gear wheels, a vertically arrangedtransmission gear member, having teeth at the lower end normally meshingwith the transmission gear wheel, and having teeth at the upper end, anintermediate gear wheel meshing with the reversing gear wheel and theupper teeth, and means tor vertically moving the gear member to breakthe chain of reversing gears, substantially as described.

3. In a tapping attachment for drilling machines, the combination of adrill spindle, the spindle gear wheel and attached transmission gearwheel rotatably mounted on tne drill spindle, a reversing gear wheelrotatably mounted on the drill spindle, a clutch collar slidably keyedto the drill spindle and adapted to be thrown into engagement witheither the transmission or reversing gear wheels, a vertically arrangedtransmission gear member, having teeth at the lower end normally meshingwith the transmission gear wheel, and having teeth at the upper end, anintermediate gear wheel meshing with the reversing gear wheel and theupper teeth, a yoke engaging the upper end oi" the vertically arrangedgear transmission member, an arm connected with said yoke, a roller onsaid arm, and an inclined trackway adjacent to the gear transmissionmember and adapted to provide means forvertically adjusting the positionof the yoke, substantiallv described.

ln combination with the trame of a drilling machine, and a verticaldrill spindle journaled therein, a spindle gear dle and located abovethe frame, a transmission gear wheel secured to and located above `thespindle gear wheel, a *reversing attachment 'frame comprising side armsmerging into a` journal bracket head at their upper ends, within whichbracket head the upper end of the drill spindle is journaled, areversing gear wheel rotatably mounted on the drill spindle below thebracket head, a clutch slidably keyed to. the spindle and adapted tothrow the spindle into engagement with one or the other of thetransmitting or reversing gear wheels, a vertical transmission shaftslidably mounted between the arms ot' the bracket and having, at itslower end, teeth adapted to mesh with the transmission gear wheel, andhaving, at its upper end, teeth adapted to mesh with the reversing gearwheel, the said vertical shaft having a grooved head at the upper endthereof, a yoke adapted to engage said groove, an arm with which theyoke is connected, a roller on the arm, an inclined trackway along whichthe roller is adapted to run, provided, at its upper end, with a recessadapted to receive the roller and pre` vent its descent, and a lever forswinging the arm to move the roller along Vthe inclined trackway toraise and lower the yoke and throw the transmission gear shaft inte andout of meshing position, substantially as described.

5. ln a tapping attachment for drilling machines, the combination of adrill spindle, t-he spindle gear wheel and connected transmission spurgear rotatably mounted on the drill spindle, a clutch -collar slidablykeyed on the drill spindle and adapted, when in lowered position, toengage with the transmission gear wheel, an upper reversing spur gearwheel rotatably mounted on the spindle above the clutch collar, andtransmission spur gearing in mesh with the transmission gear wheel andthe reversing gear wheel, substantially as described.

6. In a tapping attachment for drilling machines, the combination of adrill spindle, the spindle gear .wheel and connected transmission spurgear rotatably mounted on the drill spindle, a clutch collar slidablykeyed on the drill spindle and adapted, when in lowered position, toengage with the transmission gear wheel, an upper reversing spur gearwheel rotatably mounted on the spindle above the clutch collar,transmission spur gearing in mesh with the transmission spur gear wheeland the reversing spur gear wheel, and means for throwing thetransmission gearing out of operative position, substantially asdescribed.

7. In a tapping attachment for drilling machines, the combination of adrill spindle, the spindle gear wheel and connected transmission spurgear rotatably mounted on the CTI.

drill spindle', a elutc'li coll-ar slidablylreyed o'ii the drill spindleand adapted, when iii lowered position, to engage with the transmissiongear Wheel, an upper reversing spur gear Wheel rotatably mounted on thespindle above the clutch collar, transmission spur gearing in inesliWith the transmission spur gear WheelY and the reversing spur gearAROBERT MILNE.-

Vitnesses SAMUEL H. BECK, SAMUEL W. BANNINGr

